diff --git a/frappy_psi/dilution_statemachine.py b/frappy_psi/dilution_statemachine.py
index 9f12f87..342c9da 100644
--- a/frappy_psi/dilution_statemachine.py
+++ b/frappy_psi/dilution_statemachine.py
@@ -206,7 +206,7 @@ class Dilution(HasStates, Drivable):
            self.initialize_circulation_valves()
         return Retry
 
-    @status_code(BUSY, 'remove (wait for turbo shut down)'')
+    @status_code(BUSY, 'remove (wait for turbo shut down)')
     def remove(self, state):
         """Entfernt die Mischung."""
             
diff --git a/frappy_psi/logo.py b/frappy_psi/logo.py
index 6b243b2..f8b301b 100644
--- a/frappy_psi/logo.py
+++ b/frappy_psi/logo.py
@@ -63,11 +63,17 @@ class IO(Communicator):
             self._init()
             cmd = cmd.split(maxsplit=1)
             if len(cmd) == 2:
+                self.comLog('> %s %s', cmd[0], cmd[1])
                 self._plc.write(cmd[0], literal_eval(cmd[1]))
+                self.comLog('< OK')
             try:
-                return self._plc.read(cmd[0])
+                self.comLog('> %s', cmd[0])
+                reply = self._plc.read(cmd[0])
+                self.comLog('< %s', reply)
+                return reply
             except Exception as e:
                 if self._plc:
+                    self.comLog('? %r', e)
                     self.log.exception('error in plc read')
                 self._plc = None
                 raise    
@@ -127,7 +133,7 @@ class Valve(Snap7Mixin, Drivable):
         self.set_vm_value(self.vm_address_output, target)
         self._remaining_tries = 5
         self.status = BUSY, 'switching'
-        self.setFastPoll(True, 0.001)
+        self.setFastPoll(True, 0.5)
 
     def read_status(self):
         self.log.debug('read_status')